BLOOM FORMING PHYTOPLANKTON AND THEIR COMPARATIVE LIMNOLOGY IN WASTEWATER LAGOONS OF BANGLADESH
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1 Bangladesh J. Bot. 46(1): 43-51, 2017 (March) BLOOM FORMING PHYTOPLANKTON AND THEIR COMPARATIVE LIMNOLOGY IN WASTEWATER LAGOONS OF BANGLADESH MD ATAUL GANI 1 *, MD ALMUJADDADE ALFASANE AND MONIRUZZAMAN KHONDKER Department of Botany, University of Dhaka, Dhaka 1000, Bangladesh Key words: Bloom forming phytoplankton, Limnology, Wastewater lagoons, Bangladesh Abstract Fifteen phytoplankton, namely Arthrospira platensis Gomont, Merismopedia glauca (Ehrenb.) Näg., Microcystis aeruginosa Kützing, Synechocystis salina Wislouch, Chlorella vulgaris Beyerinck, Coelastrum microporum Nägelli, Crucigenia quadrata Morren, Euglena sp., Euglena acus (Müller) Ehrenberg, Trachelomonas volvocina Ehrenberg, Phacus acuminatus var. granulatus (Roll) Huber-Pest., Gomphonema pervulum (Kützing) H.F. Van Heurck, Cyclotella comensis Grunow in Van Heurck, Cryptomonas erosa var. reflexa M. Marsson and Rhodomonas lens Pascher et Ruttner have been considered as bloom forming species in the wastewater lagoons of Bangladesh during the sampling period of October, 2009 to July, Comparative limnological analysis was done in association with different physicochemical variables from the two lagoons. Cluster analysis separated the bloom forming phytoplankton into four groups and SIMPER analysis showed M. aeruginosa, Mer. glauca, Euglena sp. and A. platensis were responsible for each of the groupings. Result of PCA and regression analysis showed significant correlation of air temperature, water temperature, NO 3 -N and SRP with A. platensis, Mer. glauca and Eulgena sp. Introduction Algal blooms occur in aquatic habitats due to the enhancement of nutrients. Limnologists are concerned about blooms of algae in ponds, reservoirs, lagoons, lakes, creeks, streams and rivers because their existence can have ecological, economical, recreational and human health impacts. Mainly, different pigmented species of phytoplankton cause bloom and discoloration of water. Densities of bloom forming phytoplankton may vary from ind/l (Islam and Khondker 1994, Maestrini and Granéli 1991, Reynolds 1972). Blue-green algae often bloom in the lagoons and Arthrospira platensis was the most dominant species. Besides, other common blue-green algae in waste treatment lagoons include Microcystis aerugionosa, M. marginata, Merismopedia glauca and Synechocystis aquatilis. Species of green algae, such as Chlorella vulgaris, Crucigenia crucifera, Coelastrum microporum and Scenedesmus sp. also form blooms (Onyema 2013, Muthukumar et al. 2007). In Bangladesh, Islam and Morshed (1985) studied the bloom forming algae of the estuarine habitat. Related to the blooms of wastewater lagoons, few studies are available assessing the relationship between bloom forming phytoplankton and nutrient concentrations (Oudra 1990, Pereira et al. 2001, Vasconcelos and Pereira 2001, Chindah et al. 2007, Onyema 2010, Gani et al. 2011, Badr and Moghazy 2013). In sewage lagoons, phytoplankton bloom is desirable as they generate oxygen needed by bacteria for waste stabilization. There was a shift in the algal species present in the lagoons through the seasons, caused by different physicochemical parameters as well as nutrients upload (Gani et al. 2011). The present study is conducted at the two lagoons of Pagla Sewage Treatment Plant (PSTP) in Narayanganj, Bangladesh to determine the relationship of bloom forming phytoplankton with other limnological factors. Author for correspondence: <gmdataul@bot.jnu.ac.bd>. 1 Department of Botany, Jagannath University, Dhaka-1100, Bangladesh.
2 44 GANI et al. Materials and Methods Samples for the present investigation were collected from the two lagoons (L1 and L2) of PSTP situated near Pagla Bazar in Naraynaganj, Bangladesh. The sampled lagoons L1 (lagoon 1) and L2 (lagoon 10) coordinated by 23 40'54.32" N 90 27'15.02"E and 23 40'42.69"N 90 27'5.53"E, respectively. Details about the study site and sampling procedure were described in Gani et al. (2011). Counting of phytoplankton was done with the help of a HBCC (Helber bacterial counting chamber) under a compound microscope (Nikon SE, Japan) at a magnification of 400. Each sample was counted three times. Different limnological parameters such as air and water temperatures, Secchi depth, TDS (total dissolved solids), conductivity, ph, alkalinity, dissolved oxygen (DO), soluble reactive silicate (SRS), soluble reactive phosphate (SRP) and NO 3 -N were determined (Gani et al. 2011). In the present investigation, species in a population contributed >10% of the total phytoplankton density were considered as bloom forming. To perform statistical analyses all data were transformed log (x+1) except for ph, air and water temperatures which were arsine standardized. The hierarchical clustering analysis (Primer v6: Clarke and Gorley 2001), based on Bray-Curtis index was applied to the species of bloom forming phytoplankton for grouping them. Similarity percentage analysis (SIMPER analysis) (Primer v6: Clarke and Gorley 2001) was used to distinguish the phytoplankton species contributing to similarity and dissimilarity between the groups. Principal component analysis (PCA) (Primer v6: Clarke and Gorley 2006) was applied to the different limnological variables to find out significant variables with respect to different sampling periods. Later on, regression analysis (Statistica v8) was performed between bloom forming phytoplankton and PC scores (resulted from PCA) to find out the relationship between individual phytoplankton species and significant limnological variables. Results and Discussion In the present investigation, fifteen bloom forming phytoplankton were recorded from the lagoons (L1 and L2) of PSTP. The algal species belonged to five major groups and based on their chlorophyll type, these are categorized as blue-green (Cyanophyceae), green (Chlorophyceae), yellow-brown (Bacillariophyceae), euglenooids (Euglenophyceae) and cryptmonads algae (Cryptophyceae). The class Cyanophyceae and Euglenophyceae consisted of four bloom forming species each, where Bacillariophyceae and Cryptophyceae consisted of two species each and rest three species belonged to Chlorophyceae. In El-Sadat wastewater treatment plant (WWTP) of Egypt, phytoplankton, in general, belonged to Chlorophyta, Euglenophyta, Cyanobacteria and Bacillariophyta (Badr and Moghazy 2013). Oudra (1990) reported cyanobacteria dominated blooms in some wastewater treatment plants (WWTP) of Morocco. The occurrence of cyanophycean bloom in freshwater consists of both toxin and non toxin producing species (Baker and Humpage 1994). Arthrospira. platensis was the most frequent bloom forming species found during five sampling periods in L2 and three sampling periods in L1 while Microcystis. aeruginosa was the most dominant bloom forming species contributing the abundance of 99% to the total. This finding was similar to observation of Pereira et al. (2001) where M. aeruginosa was one of the dominant cyanobacteria in WWTP of Northern Portugal. M. aeruginosa considered as toxic cyanobacteria (Hoek et al. 1995), occurred in L2 of the present investigation in summer (Table 1). Several studies reveal that Microcystis spp. rapidly grow in the water column at the end of spring and continue dominating during summer period (Vasconcelos and Pereira 2001, Reynolds 2006). A. platensis a non toxic and edible species populates tropical and subtropical water bodies with high ph (Nyabuto et al. 2015). During the present investigation bloom forming incident of the species was observed several times in L1 and L2 within the range
3 BLOOM FORMING PHYTOPLANKTON AND THEIR COMPARATIVE LIMNOLOGY 45 of water temperature o C and ph During these periods, other limnological variables such as Secchi depth ( cm), alkalinity ( meq/l), DO ( mg/l), SRP ( µg/l) and SRS ( mg/l) showed wide range of variation. Mean values of conductivity (L1 = 923 and L-2 = µs/cm), alkalinity (L1 = 8.10 and L2 = 6.01 meq/l), DO (L1 = 4.9 and L2 = 6.9 mg/l) and SRS (L1 = and L2 = mg/l) differed greatly in L1 to L2. Merismopedia. glauca formed bloom during three sampling periods in L2 because in lagoon L2 sedimentation process was not so frequent like L1 supporting the condition as recorded in Izmit Bay (Aktan and Aykulu 2003). During these periods the concentration of NO 3 -N (mean value 7.35 mg/l) was the highest in comparison to other Cyanophyceae and relatively low concentration of SRS (mean value mg/l) and SRP (mean value ) and high value of Secchi depth (mean value cm) was observed. Synechocystis was common in some wastewater treatment plants (Oudra 1990). In the present study, Synechocystis salina prevailed at lowest value of DO (3.19 mg/l). However, Chlorella vulgaris dominated at low DO and relatively high SRS concentration in L1. It was evident that both the species are able to survive under high pollutant load (El-Kassas and Sallam 2014). Among the two other green algae Crucigenia quadrata and Coelastrum microporum recorded from L2, the later species contributed about 51% to the total abundance. Among euglenoids, Euglena sp. showed four blooms in L2 and one in L1. Except one sampling (Feb B-L2), euglenoid bloom contributed greater than 50% to the total abundance. In the facultative pond of Esmoriz wastewater treatment plant, euglenoids accounted 96% of total phytoplankton density where Euglena sp. was dominant (Periera et al. 2001). In case of L1 the relative abundance was about 79% and physicochemical data were characterized by higher value of air temperature (L1 = and L2 = o C), water temperature (L1 = and L2 = o C), Secchi depth (L1 = 34.0 and L2 = 21.5 cm), TDS (L1 = and L2 = mg/l), conductivity (L1 = and L2 = µs/cm), alkalinity (L1=7.30 and L2=6.67 meq/l), DO (L1 = 6.30 and L2 = 5.69 mg/l) and SRP (L1 = and L2 = µg/l ) than the mean value of L2. Other three euglenoids were Euglena acus and Phacus acuminatus var. granulatus recorded from L1 and Trachelomonas volvocina recorded form L2. The relative abundance of E. acus was about 55% to the total and it was occurred completely anoxic condition (DO=0). Comparatively lower value of Secchi depth (14 cm) and higher value of TDS (591 mg/l) and conductivity (1137 µs/cm) were observed during the euglenoid blooms. The class Bacillariophyceae, which was another common group in other wastewater lagoons (Oudra 1990, Periera et al and Badr and Moghazy 2013) represented by Gomphonema pervulum and Cyclotella comensis contributed greater than 50% abundance to the total and occurred in L1 and L2, respectively. Comparatively high concentration of NO 3 -N was accounted during this period and G. pervulum was recorded during acidic condition (ph< 7). The last bloom forming phytoplankton group was cryptomonad type where Cryptomomas erosa var. reflexa and Rhodomonas lens were recorded from L1 and characterized by higher concentration of SRP than green and yellow-brown pigmented algae (Table 1). Cluster analysis performed by Primer was separated the samplings in four groups (Fig. 1). Group A consisted of 2 samples collected in July A and July B from L2 and during these periods, only bloom of M. aeruginosa was recorded, Group C consisted of 3 samples collected from L2, during these periods Mer. glauca was prominent bloom forming species, Group D consisted of 5 samples collected from L2, during these periods Euglena sp. as well as C. quadrata and T. volvocina was recorded and Group B consisted of 8 samples collected from L1 and L2. Results of SIMPER analysis (Table 2) indicated that M. aeruginosa, Mer. glauca, Euglena sp. and A. platensis were the species responsible for groupings of A, C, D and B, respectively.
4 46 GANI et al.
5 BLOOM FORMING PHYTOPLANKTON AND THEIR COMPARATIVE LIMNOLOGY 47
6 48 GANI et al. Fig. 1. Bray-Curtis similarity dendrogram of the bloom forming phytoplankton samples of PSTP found during sampling period of October 2010 to July (Samples of Jan A-L1, Feb A-L2, Apr B-L1 and May A-L1 were cut off for low contributions: <50%). Fig. 2. Principal component analysis (PCA) plot of the first two PC axes on the transformed environmental data (Air temp. = Air temperature, Water temp. = Water temperature, SRP and NO 3 -N). PCA analysis resulted three statistically significant (eigenvalues >1.0) principal components (PCs). The first two PCs explained 91.3% of the total variance (Fig. 2). PC1 correlated negatively to air temperature (r = ) and water temperature (r = ). PC2 correlated negatively with NO 3 -N (r = ) and positively with SRP (r =0.432). Regression analysis (Fig. 3) between PC1,
7 BLOOM FORMING PHYTOPLANKTON AND THEIR COMPARATIVE LIMNOLOGY 49 Table 2. Results of SIMPER analysis of the samples of bloom forming phytoplankton from PSTP during the study period (October 2010-July 2011). Group D - Average similarity: Species Av. abund Contrib% Euglena sp Group B - Average similarity: Species Av. abund Contrib% Arthrospira platensis Group A - Average similarity: Species Av. abund Contrib% Microcystis aeruginosa Group C - Average similarity: Species Av. abund Contrib% Merismopedia glauca Groups D & B - Average dissimilarity = Group D Group B Euglena sp Arthrospira platensis Groups D & A - Average dissimilarity = Group D Group A Euglena sp Groups B & A - Average dissimilarity = Group B Group A Arthrospira platensis Groups D & C - Average dissimilarity = Group D Group C Merismopedia glauca Euglena sp Groups B & C - Average dissimilarity = Group B Group C Merismopedia glauca Arthrospira platensis Groups A & C - Average dissimilarity = Group A Group C Merimopedia glauca Microcystis aeruginosa *Av. abund = Average abundance and contrib% = Contribution in percentage.
8 50 GANI et al. PC2 and abundance of bloom forming species showed that only three bloom forming species correlated with PCs scores. A. platensis (r = -0.47; p<0.05) and Euglena sp. (r = 57; p<0.05) were correlated with PC1 and that established the impact of air and water temperatures on the abundance of both species. A B C Fig. 3. Correlation matrix between PCs score (PC1 and PC2) and different bloom forming phytoplankton species (abundance of species log(x+1) transformed). (A) PC1 correlated negatively with Arthrospira platensis (r = 0.47; p < 0.05), (B) PC1 correlated positively with Euglena sp. (r = 57; p < 0.05) and (C) PC2 correlated negatively with Merismopedia glauca (r = 0.61; p < 0.05). In case of A. platensis the impact was positive. That means increase of air and water temperatures increase the growth of the species. But in case of Euglena sp. the impact was negative. Another bloom forming species Mer. glauca (r = 0.61; p < 0.05) correlated negatively with PC2. This also evident there was strong positive impact of NO 3 -N on the abundance of Mer. glauca meaning increasing tendency of the growth of the species aggregates by NO 3 -N concentration. Negative impact of SRP on the growth of Mer. glauca was also revealed by regression analysis. Present investigation revealed that statistically significant correlation was found between four limnological variables of air and water temperatures, NO 3 -N and SRP and three bloom forming phytoplankton of A. platensis, Mer. glauca and Eulgena sp.
9 BLOOM FORMING PHYTOPLANKTON AND THEIR COMPARATIVE LIMNOLOGY 51 References Aktan Y and Aykulu G A Study on the Occurrence of Merismopedia Meyen (Cyanobacteria). Populations on the Littoral Sediments of Üzmit Bay (Turkey). Turk J Bot. 27: Badr SA and Moghazy RM Phytoplankton and Nutrient Dynamics in El-Sadat Wastewater Treatment Plant (Egypt). Journal of Applied Sciences Research 9(8): Baker PD and Humpage AR Toxicity associated with commonly occurring cyanobacteria in surface waters of Murray-Darling Basin, Australia. Aust. Jour. Marine and Freshwat. Res. 45(5): Chindah AC, Braide SA, Amakiri J and Izundu E Succession of phytoplankton in a municipal waste water treatment system under sunlight Revista UDO Agrícola 7(1): Clarke KR and Gorley RN Primer v6: User Manual/Tutorial. Plymouth Marine Laboratory: Plymouth. El-Kassas HY and Sallam LA Bioremediation of the textile waste effluent by Chlorella vulgaris. Egyptian Journal of Aquatic Research. Gani MA, Alfasane MA and Khondker M Limnology of wastewater treatment lagoons at Pagla, Narayanganj. Bangladesh J. Bot. 40(1): Hoek C, Mann D and Jahns HM Algae: An introduction to Phycology. Cambridge University Press, Cambridge, 623 pp. Islam AKM Nurul and Khondker M New records of algae from Bangladesh IV. Heteromastix and Gonyostomum. Bangladesh J. Bot. 21: Islam AKM Nurul and Morshed MG Occurrence of diatom bloom in the coastal area of Bangladesh. Bangladesh J. Bot. 14(2): Maestrini S and Granéli E Environmental conditions and ecophysiological mechanisms which led to the 1988 Chrysochromulina polylepis bloom: an hypothesis. Oceanol Acta 14: Muthukumar C, Muralitharan G, Vijayakumar R, Panneerselvam A and Thajuddin N Cyanobacterial biodiversity from different freshwater ponds of Thanjavur, Tamilnadu (India). Acta Botanica Malacitana 32: Nyabuto DK, Cao K, Mariga AM, Kibue GW, He M and Changhai Wang C Growth performance and biochemical analysis of the genus Spirulina under different physical and chemical environmental factors. Afr. J. Agric. Res. 10(36): Onyema IC Phytoplankton diversity and succession in the Iyagbe lagoon, Lagos. 43(1): Onyema IC Phytoplakton Bio-Indicators of Water Quality Situations In The Iyagbe Lagoon, South- Western Nigeria. ActaSATECH. 4(2): Oudra B Bassins de stabilization anairobie facultatifpour le traitement des eaux usees d.marrakesh: Dynamigue du phytoplankton (microplankton et picoplankton) et evaluation de lu biomane primaire. These de 3eme cycle. Univ, Cady Ayyad. Fac. Sci. Marrakesh. 144 pp. Pereira AI, Anne I, Fidalgo ML and Vasconcelos V Phytoplankton and nutrient dynamics in two ponds of the Esmoriz wastewater treatment plant (Northern Portugal). Limnetica 20(2): Reynolds CS Growth, gas vacuolation and buoyancy in a natural population of a planktonic blue-green alga. Freshwater Biology 2: Reynolds CS The Ecology of Phytoplankton. Cambridge University Press, Cambridge. 435 pp. Vasconcelos VM and Pereira E Cyanobacteria diversity and toxicity in a wastewater treatment plant (Portugal). Wat. Res. 35 (5): (Manuscript received on 2 October, 2016; revised on 13 November, 2016)
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